Event: 400 League

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Opponent Rating Result
David J Norris 80 0 - 1
Tom Hails 80 0 - 1
Peter Sharman 80 0 - 1
Mike Hoyes 80 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-320 = (320 + 400 * (0 - 4)) / 4)

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